Expanding-reamer.



J. P. LEECH.

EXPANDING REAMER.

APPLICATION FILE'D NOV. 20 19x6.

1 fi fi fiw Patented Mar. 4, 1919 51 g. l K

Jmsezafi J 2 Beach.

Man

" citizen of the United States,.residing at 54' Vernon Place, city of Buffalo. countyot Erie, andState of New York, have invented a j ,iosnrn 'r. LEECH; or BUFFALO, NEW YORK nxrmme-nnaiimn.

To all [whom it my mama Be it known that I, Joserrr men, a

a new and useful Expanding Reamer, of

,.which the following is aspecification.

My invention relatesto expanding reamstrength, durability and efiicien'cy.

Another object of the invention metr vide a reamer of this "character that is exeeptionally Leas to adjust, and which is 09.

' pable ofvery quick, and accurate adjust ment.

Another object of the invention is to pro vide a reamer of this chjaracterthe cutters adjusted position, even when subjected to the clearance for the chips and shavings cut,

16, or Within the grooves 15. These wedgevimproved reamer.

kmg

most. severe wor vide. a reamer of this character with ample from the side of the holebeing reamed.

Another object of the invention is to provide a reamer of this character with oil ducts so arranged as to apply lubricating material to the cutting edges of the cutters.

I attain the foregoing objects by the mechanism illustrated in the accompanying drawings, in which,

-F1gure 1 IS a side elevation view of my Fig. 2 1s a transverse sectional view, taken on the'line 2-'2 of 1. Fig. 3 is. a fragmental sectional view .taken on the line 33 of Fig. 2. Fig. 4 is .a fragmental sectional view taken on i the line 4 -4: of Fig. 2. Fig. 5 is a perspec tive view of one of the cutters or blades.

Im these drawings, in which similar reference characters correspond to similar parts throughout the several views, the body or shank of the reamer is designated by the reference character 10, and is formed with oppositely disposed longitudinal slots 11 into which are normallyseatedQthe blades or cutters 12m I I v The bottoms of the slots ,or grooves 11 formseatsfor the cutters respectively, and these seats orgroovebottoms are: inclined inward andforw-ard or. toward the center of the working end of the reamer- .The metal i ne o f the objectsi if the invention is to provide .a reamer of exceptionally great Another object of the invention is'to pro specification of Lcttersratenta PatentedMan4, 19 19. iApplication' file d mem er 2c, 1916) SeriaLK o. 132,459.

. x J. g i v between these diametrically opposed grooves I forms awedge which tends to, and'does at times, force the cutters 12 farther apart, as hereinafter explained.

Set-screws 13 are seated and screw-threadofthe shank when in use. These screws are each preferably formed with a non-cylindrical socket. so as to receive a suitable wrench for loosening andtightening them. i i The" working face of each cutter or blade 12 isprovided with a longitudinal tapering groove, the taper extending from end to end and being convergent in the direction of the cutting 'end of the blade. groove in each cutter or blade is less deep at its narrow end than at its wide end. nE'ach bladeor cutter is wider at its cutting end than at its other 'end,'a nd the base of each of these cutters is forinedwith afwedge-rib l6 inward of the'tapering groove. The blades are securely held in any adjusted position in the grooves or ways 11 by the conical points'of the set screws bearing against the outwardly inclined sides of the wedges or wedge-ribs ribs being inclined laterally, and the points of the set screws being conical, there is an obvious tendency for the screws, when tightened, to draw the respective blades toward the axis of the reamer shank and thereby increase the frictional engagement of the cut- Y ter blades with'their seats, the bottoms ofthe grooves 11, and thereby offset the tendencvof the working pressure to cause the blades to recede from the" working end of the shank. This tendency to recede is, moreover, oliset by the wedge-rib of each cutter.

A third element that offsets the tendency of 1 the cutters to recede is the wedge-shaped seclow the head of the screw 17 to rotate and move axially therein; so the screw-head is protected against. becoming accidentally burred. and it will always rotate easily through the notches 19. By means of this screw 17, the cutters may simultaneously sition by tightening the set screws 13. By

loosening these set-screws, without removing them, the cutter blades may be removed, individually, so as to 'be sharpened or replaced. When the blades have been ground away beyond-the notches 19, they may still be used, by extending or removing the screw 17, for

they may-be individually adjusted by hand,

and the set-screws are amply efficient to prevent disadjustment.

In order to'provide ample clearance and accommodation for the shavings or cuttings of metal being reamed, the grooves 11 are considerably longer than the blades seated therein, so that a deep pocket is provided back of each cutter blade 12, as shown at 22, Fig.4. The shank is also cut away at 23, on opposite sides of the shank and in front ofthe cutting edges 24 and communicating with the pockets 22, so as to provide a passage-way for the cuttings, leaving the cutting edges, to enter the pockets. The cut-away portions or recesses 23 are also extended back beyond the pockets 22, so as to auxiliate the pockets in accommodating the cuttings. I

The side of each groove 11 back'of its cutter blade is higher than the side in front of the same, so as to effectively and rigidly support said cutter blade in its seat.

The shank 10 is hollow throughout its length, except where closed by the screw 17, and.oil ducts 25 communicate with the interior chamber or bore of the shank, so that the reamer is rendered self lubricating.

The face of each cutter or blade is indented at 26, so that the adjacent curved cutting edge is inclined forward of (or has a lead with relation to) the part of the working face that supports said curved cutting edge. The plane portion of the working face of each cutter coincides with a plane which is common to such plane portion of both of said cutters, and this plane also (-0- incides with the axis of rotation of the reamer. It will, therefore, be seen that if a diametrical line be drawn coincident with the bottoms of the depressions 26, thecurved cutting portions of the cutters 12 are considerably forward or in lead-of s id diametrioal line, and said depressions are in clined outwardly, and in the direction of working rotation, from said diametrical line; that is, in the direction'of the arrow in Fig. 2.

The blades or cutters 12 being imperforate, are much stronger and less expensive than are the perforated blades of known construction. They are also more easily removed and replaced, as the set-screws or locking screws do not need to be removed, but merely loosened.

What I claim as my invention is:

l. A reamer blade formed with a cutting edge and with a groove extending longitudinally of said cutting edge and varying in depth at different points throughout its engt 2. A reamer blade formed with a face having a cutting edge at one side and hav-' ing therein a groove the depth varies throughout its length.

3. A reamer blade formed with a grooved working face and with a rib and with a surface which forms one side of the groove of said working face whilealso forming one side of said rib and which is inclined with relation to said working face.

4. A reamer blade formed with a grooved face and a wedge-shaped rib and with a surface inclined with relation to said face and forming a side of said rib and a side of the groove of said face.

5. A reamer blade formed with a'groov'ed working face and a wedge-shaped rib and with a surface inclined with relation to said working face and forminga side of said rib and also forming a sideof the groove. of said working face."

6. A reamer blade having its wo fking face formed with a cutting edge at one side and ribs at its opposite side'and with a groove having one of its sides inclined with relation to the portion adjoining said cutting edge,

this inclined portion also forming one side of said rib.

7. A reamer blade formed with a cuttingedge at one side and with a notch in its opposite side, and with a groove between the cutting edge and the notch and extendinglongitudinally of said cutting edge.

8. A reamer blade formed with a cutting edge and with a wedge-shaped element eX- tending longitudinally of said cutting edge and having a notch therein.

9. In a reamer, the combination of a shank formed with grooves the bottoms of which converge toward the working end of the shank, a plurality of reamer blades each formed with a groove the depth of which varies at different points in. its length and each. of said blades being seated within one of said grooves of the shank, and set screws of which adapted to beadjusted, an adjusting screwengaging with the notch of said rib and op- ;erable to move said blade. along said seat to jdifierent positions of adjustment, and a' set 5 screw having a tapering point normally 10 formed with anoil chamber andwith converging blade seats on opposite sides of said oil chamber, and with oil feed ducts communicating with said oil chamber, a D111- rality of reamer' blades each formed with a notch and with a cutting edge. and being normally seated inone of said blade seats in such position thatone Qif" said oil feed ducts opens in front ofit s cu'ttinedge, means engaging With the notch of eac blade for moving the blade to different positions of adjustment alon its seat, and means for clamping each said blade securely against its respective one of the said converging blade seats.

JOSEPH P. LEEGH. 

